For illustrative purposes, I went ahead and tagged
https://www.openstreetmap.org/way/175473372. (I chose this intersection
because the way was already split, so the only edit needed was to add
the tag.)
On 10/07/2020 10.15, Matthew Woehlke wrote:
As some of you may recall, I'm working on a project to do traffic
simulation with the help of OSM data and SUMO¹.
One of the issues that SUMO has is that the typical method of modeling
intersections (which I don't propose to change, mostly) results in SUMO
thinking there are multiple intersections where there should only be
one. For example, intersections of two dual carriageways produces four
intersections and makes the turns much sharper than in reality.
My use case isn't the only one that has issues with this sort of thing;
routers can "see" more traffic lights than actually exist and can (so I
hear, anyway) give directions that are potentially confusing.
Intersection modeling is a long-standing issue that has had multiple
previous proposals.
The major two prior proposals of which I'm aware are to map the
'footprint' of the intersection as an area, or to create relations to
map the intersection. Both are difficult, both to model, and for tools
to parse. The area proposal has potential rendering issues.
I am proposing² a *much* simpler alternative, which is to simply tag the
portions of a road that are "part of" an intersection (i.e. the 'm',
'n', 'p', 'q' segments of
https://wiki.openstreetmap.org/wiki/File:Doublejunction.svg) with
junction=intersection. This is straight-forward to model, and I believe
solves most of the issues for a majority of affected intersections.
(Exceptions likely exist, but 'perfect' is the enemy of 'good', and
right now we're at 'bad'.)
Comments would be appreciated!
Also, should I start just doing this for the areas I'm trying to use for
my project, or is it better to wait for some degree of consensus?
(¹ https://www.eclipse.org/sumo/)
(² https://wiki.openstreetmap.org/wiki/Proposed_features/junction%3Dintersection)
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